Loom dobby



Oct. 6,1931. A, A, GORDON 1,826,311

` LOOM DOBBY Filed Feb. 21. 1930 2 Sheets-Sheet 1 Mia/f #fir/ @are/wz MMT@ Mgg/J Oct. 6, 1931. A. A. GORDON 1,826,311

LOOM DoBBY Filed' Feb. 21. 1930 2 sheets-sheet 2 Patented Oct. 6,1931

UNITED, srares @PATENT ePrice ALBERT A. GGR-DOIT, F, 7WORCESTER, IvLASACHUSETTS, ASSIGNOR TO CRCMPTON & KNOW'LES LOOIE WORKS, GF WORCESTER, MASSACHUSETTS. A CORPGBATIN 0F MASSACHUSETTS LOOM!V BOBBY Application iled February 2i, 1930. Serial 110.430,41).

This invention relates to a loom dobby of the general type disclosed in my prior appli.- cation Serial Number 385,507, led by me August 13, 1929. In that application, I have shown a construction by which a dobby may be indicated from a perforated pattern sheet and in which the occurrence of a perforation renders the corresponding indicating finger inoperative to initiate a harness change.

At is the object of my present invention to provide an attachment for such dobbies by `which-the entire setof indicating fingers may be rendered inoperative when it is desired to reset the harnesses or `pattern or to turn Vthe loom or the pattern cylinder backward or forward for any purpose.

A further object is to provide a connection by which the pattern mechanism will be disconnected from' the driving shaft Vwhenever the indicatingl fingers are rendered inoperative as above described.

My invention further relates to arrangements and combinations of parts which .will be hereinafter described and more particularly pointed out in the appended claims.

A preferred'form of the invention is shown in the drawings, in which Fig. 1 is a side elevation of my improved dobby; Y

Fig. 2 is a sectional plan view thereof, taken substantially along the line 2-2 in Fig. 1;

1Eig. 3 is a partial sectional side elevation, taken along the line 3-3 in Fig. 2; and

Fig. 4 is a detailfside elevation to be described.`

Referring to the drawings, I have shown a loom dobby comprising a frame supportingY a rock shaft 11 continuously oscillated from a suitable source of power (not shown) and edective to actuate a rock arm 12 connected by links 13 to upper and lower knife bars 14. Y Harness jacks 15 are provided with levers 16 to which are connected upper and lower dobby hooks 17 The lower hooks are positioned for directengagement by the upturned rear ends of lifter levers 18 and the levers 20. v

A pattern cylinder 21 supports a perforated pattern sheet 22 and is provided with a worm gear 23 engaged by a worm 24 on an upright shaft 25; VA clutch member 26 is keyed to and slidable on the shaft 25 and is adapted to engage a clutch member 27 on a driving shaft 28, aligned with the upright shaft 25.

'Ihe clutch member 26 has an annular groove 29 which receives studs on the end of a yoke lever 30 by which it may be raised against the pressure of 'a spring 31. ver 36 is pivoted at 32 on a fixed bracket 33 and `has an upwardly projecting portion 34 positioned adjacent an irregular cam 35 mounted on a cross shaft 36 supported in bearings in the frame 10. The construction and mode of operation of the cam 35 will be hereinafter described.

A cross shaft 40 is mounted in bearings in the frame 10 and is connected to the upright shaft 25 by bevel gears 41 and 42. A hand wheel 43 is also provided for manual rotation of the shaft 40.

Cams 44 on the shaft 40 engage studs 45 0n supporting members 46 suitably guided for vertical movement and having a cross shaft 47 l(Fig. 3) secured in their depending lower enc s.

- Indicating members 50 are pivoted on the cross shaft 47 and are provided with studs 51 adapted to engage perforations in the record sheet 22 and also to extend into openings 52 in the pattern cylinder 21.

The lifter levers 18 and 20 are provided with segmental slots 53 (Fig. 3) in which the upper edge of a segmental knife bar 64 may be received. The knife bar 64 is mounted at the lower end of rocking levers 65 pivoted at 66 and connected by links 67 (Figs. 1 and 2) to slotted heads 68 (Fig. 4) supported by and slidable across the shaft 40v and providedvwith studs or rolls 69 engaging additional cams 70 on the shaft 40.

In the ordinary operation of the machine, the rock shaft 47 is raised, withdrawing'the studs 51 in the indicating members 50 from the pattern sheet 22; the pattern cylinder is then advanced ninety degrees; the cross shaft 47 is returned to its lower position and the knife bar 64 is then oscillated, engaging the beveled ends of such indicating members 5() The le` as are supported on unpertorated portions of the record sheet. Such engagement causes the corresponding litter levers 18 or Q() t0 be raised with result-ant movements of the harnesses associated therewith.

rlhe mechanism thus it'ar described is largely the sa me as that disclosed in my prior application and ;''or a detailed description of the construction and operation of the parts thus tar described, reference is made to said application.

'lfhe sha'lt 3o is provided with a handle 72 (Fig. 2) by which it may be given a quarter turn, thus nnnf'ing the cam 35 Yfrom the full line to the dotted line position indicated in Fi l.

lever 'T-l is mounted on a rock shaft 75, supported in lixed bearings, and the end of the rever T-l positioned lor engagement by one i'ace et the cam Fingers 7G on the rock shaft extend under the cross rod et? en which the indicating membe 50 are pivotcd.

lflhen it is desired i o rotate the pattern cylinder i, in eitf t irection without causing ai ot the hooks l to be engaged by thelnife bai i the handle Y2 is swung over to move the cam 25 from the full line tothe dotted iine position indicated in Fig. l.

llie cam 35 is provided with three faces A, l and C. The lever 74rnormally rests agains the tace A and upon movement ot the cam is brought into engagement with the tace l?, thus Aforcing the lever downward and raising` the cross shaft Ai? and indicating members 50, so that the depending studs 51 on the indicating members are held tree of the pattern sheet 22.

iit the same time, the portion SLL of the .lever 30 sl itted from engagen'ient with the cam tace il to engagement with the cam face C, thus rocking the lever 30 to raise and disconnect the clutch collar 26. rllhis leaves the upright shaft free to be rotated in either direction by the hand wheel l-B. rEhe patern sheet may tien be moved forward or liaekward as desired so that any desired change in relationship between the pattern sheet and the harnesses may be effected. Or conversely, the loom may be operated and the shattll and rocher arm l2 may be oscillated without causing engagement of the knife bars a ith any et the hooks 17 and consequently without causing movement of the harnesses. The parts may be restored to operative relatirm by returning the cam 35 to the full line position in Fig. l.

lai-.fing thus described my invention and e advantages thereof, do not wish to be 'ted to the details herein disclosed, otherwise than as set torth in the claims, but what l claim is l. In a loom dobby, series otindieating members, a perforated pattern sheet etfective to determine operative or inoperative po'- sitions for said members, driving mechanism therefor, and a manually' operated device by which all of said indicating members may be rendered inoperative and by which said driving mechanism may be simultaneously disconnected.

2. ln a loom dobby, a series ot indicating members, a perforated pattern sheet eiiieetive te determine operative or inoperative positions for said members, driving mechanism therefor, and a single cam eliective to render all of said indicating members inoperative and to disconnect said driving mechanism.

3. In a loom dobby, a series of indicating members, a perforated pattern sheet ell'ective to determine operative or inoperative positions for said members, driving mechanisin therefor, and a single cam eli'ective to render all oit said indicating members inoperative, to disconnect said driving mechanis-m, and to hold said parts locked in inoperative positions.

-l. ln a loom dobby, a knife bar, a series of dobby hooks, lifter levers therefor, a series 'ache-ating members Jor said lifter levers, a

o pattern cylinder, a perforated pattern sheet on said cylinder etlective to determine operative and inoperat're posit-ions ior said meinbe s, driving mechanism for said pattern cyll r, automatic means tor intermittently moving all ot said indicating members to inoperative position, means acting "hrough the operatively positioned indicating members and corresponding litter levers for positioning the associated dobby hooks in the path ot the knife-bar, and an additional manually operated device by which all of said incicating members may be rendered temporarily inoperative independent of said aut-omatic means.

In testimony whereof I have hereunto attiXed my signature.

ALBERT A. GORDON. 

